sam/libqbe
1
0
Fork 0
Code Issues Pull requests Projects Releases 1 Packages Wiki Activity Actions

do sign/zero extensions removal in copy.c

Browse source
This commit is contained in:
Quentin Carbonneaux 2017-02-25 14:48:15 -05:00
parent e46b4e31e8
commit 2c2db15995
6 changed files with 66 additions and 56 deletions
Download patch file Download diff file Expand all files Collapse all files

14
ssa.c
View file

@ -31,7 +31,7 @@ adduse(Tmp *tmp, int ty, Blk *b, ...)
va_end(ap);
}
/* fill usage, phi, and class information
/* fill usage, width, phi, and class information
* must not change .visit fields
*/
void
@ -40,7 +40,7 @@ filluse(Fn *fn)
Blk *b;
Phi *p;
Ins *i;
int m, t;
int m, t, w;
uint a;
Tmp *tmp;
@ -51,6 +51,7 @@ filluse(Fn *fn)
tmp[t].nuse = 0;
tmp[t].phi = 0;
tmp[t].cls = 0;
tmp[t].width = WFull;
if (tmp[t].use == 0)
tmp[t].use = vnew(0, sizeof(Use), Pfn);
}
@ -72,7 +73,16 @@ filluse(Fn *fn)
for (i=b->ins; i-b->ins < b->nins; i++) {
if (!req(i->to, R)) {
assert(rtype(i->to) == RTmp);
w = WFull;
if (isload(i->op) && i->op != Oload)
w = Wsb + (i->op - Oloadsb);
if (isext(i->op))
w = Wsb + (i->op - Oextsb);
if (w == Wsw || w == Wuw)
if (i->cls == Kw)
w = WFull;
t = i->to.val;
tmp[t].width = w;
tmp[t].ndef++;
tmp[t].cls = i->cls;
}